Outpatient appointment scheduling problem considering patient selection behavior: data modeling and simulation optimization

Journal of Combinatorial Optimization - In medical outpatient services, due to patients’ imbalanced selection for doctors of different levels and for different visiting periods, inefficiency...     

Efficiency decomposition in dealers from the perspectives of demand forecasting,sales force,and inventory control: a case study

Efficiency decomposition is being able to know the most effective way to improve a company’s organisational efficiency. This study proposes a network performance evaluation model with non-controllable variables to evaluate dealers with an emphasis on their internal processes, including demand forecasting, sales force and inventory control. The proposed model decomposes the organisational efficiency into a weighted average of internal process efficiencies, where the weights associated with the internal processes are data-driven. This is applied to an empirical case consisting of 27 automobile parts dealers in Taiwan. Based on the analysis results, dealers know the relative contribution of each internal process to the organisational efficiency, and inefficient dealers are assigned targets for enhancing the organisational efficiency as well as the process efficiencies.     

丁酸钠在大鼠肠缺血/再灌注小肠损伤中的作用

目的:研究丁酸钠(sodium butyrate,BTR)对大鼠肠缺血/再灌注(ischemia-reperfusion,I/R)后小肠损伤的保护作用.方法:♂SD大鼠50只,随机分为假手术组(sham组),肠I/R 1 h组和4 h组(I/R1组和I/R4组),BTR干预1 h组和4 h组(BTR1组和BTR4组),每组10只.丁酸钠组和肠I/R组夹闭大鼠肠系膜上动脉30 min,恢复灌流后观察4 h,制备肠I/R模型;假手术组仅开腹不夹闭动脉.BTR组于术后立即行皮下注射BTR(400mg/kg),假手术组和肠I/R组皮下注射等量生理盐水.于I/R 1 h和4 h后,测定小肠黏膜血流量,取血浆检测血浆肿瘤坏死因子(tumor necrosis factor-α,TNF-α)水平和二胺氧化酶(diamine oxidase,DAO)活性,取小肠组织检测髓过氧化物酶(myeloperoxidase,MPO)、脂质过氧化物丙二醛(malondialdehyde,M D A)活性和血管内皮生长因子(v a s c u l a r endothelial growth factor,VEGF)含量,检测小肠微血管通透性和含水率,HE染色观察小肠病理变化.结果:肠I/R致小肠损伤组血浆T N F-α、D A O及小肠组织含水率、微血管通透性、M D A、M P O、V E G F明显高于假手术组(P<0.05),小肠黏膜血流量明显降低(P<0.05),小肠损伤明显.与对应时间点I/R组相比,B T R治疗后血浆T N F-α、D A O及小肠组织含水率、微血管通透性、MDA、MPO、VEGF明显降低(P<0.05),小肠黏膜血流量升高(P<0.05),小肠损伤减轻.结论:BTR减轻大鼠肠I/R后小肠微血管通透性、组织水肿,增高小肠黏膜血流量,具有一定的小肠保护作用.其保护机制与清除氧自由基,减轻炎症反应和降低小肠VEGF表达有关.     

2-Edge connected dominating sets and 2-Connected dominating sets of a graph

A \(k\)-connected (resp. \(k\)-edge connected) dominating set \(D\) of a connected graph \(G\) is a subset of \(V(G)\) such that \(G[D]\) is \(k\)-connected (resp. \(k\)-edge connected) and each \(v\in V(G)\backslash D\) has at least one neighbor in \(D\). The \(k\) -connected domination number (resp. \(k\) -edge connected domination number) of a graph \(G\) is the minimum size of a \(k\)-connected (resp. \(k\)-edge connected) dominating set of \(G\), and denoted by \(\gamma _k(G)\) (resp. \(\gamma '_k(G)\)). In this paper, we investigate the relation of independence number and 2-connected (resp. 2-edge-connected) domination number, and prove that for a graph \(G\), if it is \(2\)-edge connected, then \(\gamma '_2(G)\le 4\alpha (G)-1\), and it is \(2\)-connected, then \(\gamma _2(G)\le 6\alpha (G)-3\), where \(\alpha (G)\) is the independent number of \(G\).     

移动场景下网络文化消费行为执行意向的影响机制研究

执行意向在行为科学领域发挥着至关重要的预测价值,如何把握网络文化消费者行为规律成为当前热点课题。文章基于执行意向理论,以网络文化消费网民群体为研究对象,探索网络情景下文化消费行为执行意向的影响机制。实证研究结果表明感知价值、参照群体、用户信任与执行意向均存在显著正相关,且感知价值为首要因素,信息质量对执行意向的影响不显著。调节效应分析发现,时间压力在感知价值、信息质量、用户信任对执行意向的影响中均存在调节作用,时间压力在参照群体对执行意向的影响中不存在调节作用。     

一人多机的动态配置模型及其解法

本文以机械企业为背景,探讨了一人多机看管问题中的人员配置问题,并采用层次序列法对人员配置数学模型进行了求解,给出了启发式解法,指出了进一步研究的方向。     

开放信息系统动态运行的需求控制问题

与组织融为一体并相互作用的具有动态结构的开放信息系统是国民经济信息化的基础。本文抽象出信息系统动态运行的需求控制结构,提出了保证这种反馈结构的计算机信息系统的建设要求。     

Improved algorithms for largest cardinality 2-interval pattern problem

The 2-INTERVAL PATTERN problem is to find the largest constrained pattern in a set of 2-intervals. The constrained pattern is a subset of the given 2-intervals such that any pair of them are R-comparable, where model . The problem stems from the study of general representation of RNA secondary structures. In this paper, we give three improved algorithms for different models. Firstly, an O(n{log} n +L) algorithm is proposed for the case , where is the total length of all 2-intervals (density d is the maximum number of 2-intervals over any point). This improves previous O(n ²log n) algorithm. Secondly, we use dynamic programming techniques to obtain an O(nlog n + dn) algorithm for the case R = { <, ⊏ }, which improves previous O(n ²) result. Finally, we present another algorithm for the case with disjoint support(interval ground set), which improves previous O(n ²□n) upper bound. A preliminary version of this article appears in Proceedings of the 16th Annual International Symposium on Algorithms and Computation, Springer LNCS, Vol. 3827, pp. 412–421, Hainan, China, December 19–21, 2005.     

谦卑领导行为与下属工作投入：有中介的调节模型

谦卑领导行为是近年来新出现的一个广受研究者和管理实务者关注的领导主题,其有效性和作用机制有待更多实证研究的深入探讨.基于自我概念衍生理论视角,采用问卷调查法收集375份员工数据,在检验共同方法偏差和问卷信效度的基础上,通过有中介的调节作用检验程序,考察谦卑领导行为对下属工作投入的影响,并探讨下属组织自尊的中介作用和权力距离的调节作用.研究结果表明,谦卑领导行为能够显著正向预测下属的工作投入;下属的权力距离在谦卑领导行为与下属工作投入关系间发挥有中介的调节作用,对于高权力距离的下属,谦卑领导行为对其工作投入的积极影响更强;下属权力距离的调节作用通过下属组织自尊的中介实现,当下属权力距离较高时,谦卑领导行为通过下属组织自尊的中介对其工作投入产生的积极影响更加强烈.     

初始资源、社会资本与创业行动效率——基于资源匹配视角的研究

创业者所拥有的初始资源基础及其可利用的社会资本对于新企业绩效的重要作用已被广泛证实,但对于二者在创业行动层面的角色尚缺乏深入探索.基于此,本文从关系强度与关系资源的角度考量社会资本,考察了初始资源、关系强度和关系资源与创业行动效率间的关系,以及资源获取匹配度对该作用过程的调节作用.结果显示,在创业过程中,拥有充裕的初始资源,能够利用丰富的社会资本的创业者更易于快速采取创业行动,促进新企业生成.当创业者利用关系资源获取与初始资源相匹配的资源时,关系资源促进创业行动效率的作用更为显著.本文的理论贡献在于深入行动效率挖掘初始资源与社会资本改善创业行动效率的作用机制,从资源匹配的视角剖析社会资本的作用机理,研究发现,社会资本作用的发挥源于其为创业者所提供资源的匹配效果,而非其自身的存量特征,这是解释创业行动效率差异的一个重要原因.